Mechanical cement trowel or floater



March 3, 1953 s, w. MARSH 2,630,048

MECHANICAL CEMENT TROWEL 0R FLOATER Filed Nov. 14, 1950 INVENTOR. JrA/wn W M/ww/ Patented Mar. 3, 1953 MECHANICAL CEMENT mower on FLOATER Stanley W; Marsh, Valley Falls, Kans.

Application November 14, 1950, Serial No. 195,546

2 Claims. 1

. This invention relates to masonry and concrete implements, and more particularly to a mechanical cement trowel or floater.

An object of this invention is to provide a cement trowel of the type including an oscillatory plate which is particularly adapted to float and finish cement work.

Another object of this invention is to provide a cement trowel which is electrically actuated and is particularly adapted for easy maneuverability by an operator.

A further object of this invention is to provide a mechanical cement trowel or floater which is relatively simple in structure and cheap to manufacture.

A still further object of this invention is to provide a mechanical cement trowel or floater which is light and compact in structure to there by particularly adapt the trowel for easy portability.

The above and still further objects and advantages of the present invention will become apparent upon considering the following detail description of the invention, when taken in conjunction with the accompanying drawings, wherein:

Figure 1 is a top plan view of the mechanical cement trowel of the present invention;

Figure 2 is a sectional view taken substantially along the line 2-2 of Figure 1; a

Figure 3 is an end elevational view taken from the left of Figure 1.

Referring now more particularly to the "drawings, wherein like reference numerals have been used throughout the several views to designate like parts, there is shown the mechanical cement trowel of the present invention, generally designated by the reference numeral III which includes a base plate I I and a work engaging plate I2 disposed in spaced parallel and confronting relation with respect to the base plate.

Extending between the base plate II and the work engaging plate are the resilient elements generally designated by the reference numeral I3 which are secured between the base and work engaging plates.

Operatively connected to the work engaging plate is the electrically actuated motive means It which includes an electric motor I5 and an offset or driven shaft I6 for effecting the oscillatory movement of the work engaging plate I2 in a plane substantially parallel to the plane of the base plate. The motive means I4 embodies the ofiset shaft I6 which has its long axis disposed transversely of the plates II, I2 in perpendicular relation to said planes of the plates and has one end projecting through an aperture I1 provided in the base plate II and has the other end terminating contiguousto the inner face I8 of the work engaging plate I2. Carried by the outer face I9 of the base plate II is a bearing 20 which rotatably journals the adjacent end of the offset shaft. Carried by the inner face I8 of the work engaging plate I2 is a second bearing 2I which rotatably journals the stub shaft 22 carried by the offset shaft I5, and having its axis offset from said axis of the shaft I6, for movement of the stub shaft through a circular path about the axis of the shaft I6; It is to be noted that there is clearance between the inner race 23 of the bearing 2| and thestub shaft22 to thereby loosely rotatably journal the adjacent end of the offset shaft I6 to permit the desired oscillatory movement of the work engaging plate I2 with respect to the base plate II. The electric motor is spaced above the outer face I9 of the base plate II and is supported by means of the bracket 25 which is carried by the base plate II and bolted to the base 26 of the motor I5 by means of the bolts 21, 28. The motor I5 includes a power shaft 29 which projects through a longitudinally extending slot 30 provided in the base plate II, the power shaft being arranged in spaced parallel relation with respect to the offset shaft I6.

Disposed intermediate the base and work engaging plates II, I2 is a pulley 3| which is circumposed about the offset shaft and secured transversely thereof in a. plane paralleling the planes of the plates. Arranged in coplanar relation with respect to the pulley 3| is a pulley 32 which is carried by the adjacent end of the power shaft 29. An endless belt 33 is trained about the pulleys 3|, 32 and couples the power shaft 29 of the motor I5 to the offset shaft I6.

Accordingly upon actuation of the motor, the off-- set shaft IE will impart the desired oscillatory movement to the work engaging plate I2 to thereby float and finish the cement being worked.

Carried on the outer face of the base plate II contiguous to each side edge thereof are the opposed L-shaped hand grips 34, 35 which permit the cement trowel to be manually grasped by an operator to move the work engaging face I2 into engagement with the cement work to be floated and finished.

As clearly shown in Figure 3, the hand grips 3, 35 are each pivotally mounted for rotary movement about an axis at right angles to the base plate I I. The hand grip 84 is pivoted by the pin 35 secured thereto and journaled transversely of the base plate I I, and the hand grip 35 is pivoted by the pin 37 secured thereto and journaled transversely of the base plate II.

Although only one embodiment of the cement trowel of the present invention has been described it is readily apparent that numerous modifications can be made without departing from the spirit "of the invention set forth in the appendedclaims.

What I claim is:

1. A cement trowel comprising a base plate and a work engaging plate arranged in spaced parallel planes, resilient means extending between said base and work engaging plates respectively, and electrically actuated motive means operatively connected to said work engaging-plate for effecting the oscillatory movement of the latter in a plane substantially parallel to said base plate, said motive means including a driven shaft having its long axis perpendicular to the planes of said plates and having one end rotatably journaledon said base plate, a stub shaft extending from the other endof and having its axis offset from said axis of the driven shaft, for movement "of the stub shaft through a circular path about said axis of the driven shaft, said stub shaft being rotatably journaled on said work engaging plate, an electric motor arranged outwardly of said base plate and secured to the latter, said motor including a power shaft arranged in spaced parallel relation with respect to said driven shaft and projecting into the space between said plates, and coupling means operatively connecting said power shaft to said driven shaft.

2. A cement trowel comprising a base plate and a work engaging plate arranged in spaced parallel planes, resilient means extending between said "base and work engaging. plates respectively, and

electrically actuated motive means operatively connected to said work engaging plate for effecting the oscillatory movement of the latter in a plane substantially parallel to said base plate, said motive means including a driven shaft having its long axis perpendicular to the planes of said plates and having one end rotatably journaled on said base plate, a stub shaft extending from the other end of and having its axis offset from said axis of the driven shaft, for movement of the stub shaft through a circular path about said axis of the driven shaft, said stub shaft being rotatably journaled on said work engaging plate, an electric motor arranged outwardly of said base plate and secured to the latter, said motor including a power shaft arranged in spaced parallel relation with respect to said driven shaft and projecting into the space between said plates, and coupling means operatively connecting said power shaft to said driven shaft, said. coupling means comprising a first pulley circumposedabout said driven shaft and secured transversely thereof to rotate in a plane parallel ing said planes of the plate, a second pulley arranged in coplanar relation with respect to said first pulley and carried by said power shaft, and an endless belt trained about said pulleys.

STANLEY W. MARSH.

REFERENCES CITED The following references are of record in the file of thispatent:

UNITED STATES PATENTS Number Name Date 2,223,024 Beierlein Nov, 26, 1940 2,224,506 Baily Dec. 10, 1940 2,411,317 Day et al Nov. 19, 1946 

